For condensate extraction, as suggests, one from the discount store is certainly enough. Mine is currently no better because of the cement-dust-containing condensate. An insane amount of water accumulates; at the moment I have to empty the refill container after every(!) window.
For general window cleaning, I also use the yellow one but have no experience with other brands. I just know that since I got these things, I enjoy window cleaning ops:
cool place, how many square meters do you have, or did I overlook that?